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Configuration Set

A configuration set is a set of rules that you apply to the
voice messages that you send. In a configuration set, you can specify a destination
for specific types of events related to voice messages. For example, when a message
is successfully delivered, you can log that event to an Amazon CloudWatch
destination, or send notifications to endpoints that are subscribed to an Amazon SNS
topic.

When you send a voice message, you have to specify one (and only one)
configuration set.